OK so trickle charging killed the battery!
New battery and all good, next problem.
All set for a ride with Jaffa today, we got 2 blocks from home and my clutch cable snapped!
Thought that was me screwed till mid January then remembered my brother-in-law had 4 of these bikes in rebuild, quick call and I'm up and running again.
Note: the clutch cable from the Custom CB650 is quite a bit longer than my CB650PZ, also remembering that the standard CB650 cable is shorter!
My bro in law told me a company called Ansin & Monteith will make up cables to any length I want so once the Xmas New Year break is over I'll pop in and see them.